diff --git a/min-bindings/python/Makefile b/min-bindings/python/Makefile
index 5bd50c3..fe328ea 100644
--- a/min-bindings/python/Makefile
+++ b/min-bindings/python/Makefile
@@ -11,5 +11,8 @@ test: tests.py ckzg.so
 ecc_test: py_ecc_tests.py ckzg.so
 	python $<
 
-ckzg.so: ckzg.c ../../min-src/c_kzg_4844.o ../../lib/libblst.a
+libblst.a: ../../lib/libblst.a
+	objcopy --globalize-symbol=sha256_init --globalize-symbol=sha256_update --globalize-symbol=sha256_final $< $@
+
+ckzg.so: ckzg.c ../../min-src/c_kzg_4844.o libblst.a
 	clang -O -Wall -shared -fPIC -Wl,-Bsymbolic -I${INCLUDE_PY} ${addprefix -I,${INCLUDE_DIRS}} -o $@ $^
diff --git a/min-src/c_kzg_4844.c b/min-src/c_kzg_4844.c
index c944970..5e44a3b 100644
--- a/min-src/c_kzg_4844.c
+++ b/min-src/c_kzg_4844.c
@@ -1048,9 +1048,9 @@ typedef struct {
     size_t off;
 } SHA256_CTX;
 
-extern void sha256_init(SHA256_CTX *ctx);
-extern void sha256_update(SHA256_CTX *ctx, const void *_inp, size_t len);
-extern void sha256_final(unsigned char md[32], SHA256_CTX *ctx);
+void sha256_init(SHA256_CTX *ctx);
+void sha256_update(SHA256_CTX *ctx, const void *_inp, size_t len);
+void sha256_final(unsigned char md[32], SHA256_CTX *ctx);
 
 static void hash(uint8_t md[32], uint8_t input[], size_t n) {
   SHA256_CTX ctx;